13670878221 has 64 divisors (see below), whose sum is σ = 27193098240. Its totient is φ = 6555453120.

The previous prime is 13670878187. The next prime is 13670878223. The reversal of 13670878221 is 12287807631.

It is not a de Polignac number, because 13670878221 - 2⁷ = 13670878093 is a prime.

It is a super-2 number, since 2×13670878221² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13670878223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 225885 + ... + 279938.

It is an arithmetic number, because the mean of its divisors is an integer number (424892160).

Almost surely, 2^13670878221 is an apocalyptic number.

13670878221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13670878221 is a deficient number, since it is larger than the sum of its proper divisors (13522220019).

13670878221 is a wasteful number, since it uses less digits than its factorization.

13670878221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505863 (or 505857 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 13670878221 in words is "thirteen billion, six hundred seventy million, eight hundred seventy-eight thousand, two hundred twenty-one".